Application of the Integral Equation-Asymptotic Phase (Ie-Ap) Method To Three-Dimensional Scattering

Abstract

An approach for numerically analyzing electromagnetic scattering from convex conducting obstacles which possess large, relatively smooth surfaces is discussed in this work. In this approach, the current density induced on the scatterer is represented in terms of basis functions which are capable of representing rapid phase variation with very few unknowns per square wavelength. The unknowns associated with the surface current are then determined through testing of appropriate surface integral equations. A special technique is introduced to accelerate calculations of portions of the resultant matrix equation associated with shadow regions and edges. The results of a series of numerical experiments on canonical objects demonstrate the efficiency and accuracy of the technique.